Tana Rapids is the largest rapids in the Mun River. At its center lies a massive rock formation, which acts as an island amid the tumultuous currents created by the converging streams of the Mun River, eroding a rock face standing approximately 1 meter high. The best time to visit is between September and December each year. Sa Huai Mak is located 10 kilometers from the park headquarters, in the area of Ban Huai Mak Tai, Tambon Khong Chiam. Sa Huai Mak is formed by water flowing through layers of exposed stone in the Huai Mak stream, measuring about 50 meters wide and 150 meters long, cascading downward before it meets the Mekong River. The ideal time for a visit is also between September and December each year.